The authorial voice is best defined as
the voice used by authors when seeming to speak for themselves
the voice that expresses the historical author's opinions
the fictional narrator that may have a different personality, background, or viewpoint from the historical author
the attitude the author or narrator has toward the subject matter

The authorial voice is best defined as the voice used by authors when seeming to speak for themselves.

Explanation:

The voice of the author and his writing style of writing is said to be an authorial voice. It varies from author to author. Every author has their kind of voice and part to play in their narrative. It defines the attitude of the author towards any specific subject.

faulty parallelism is a grammar construction where there is no balance in the parts of a sentence they have a similar meaning but the grammar structure is not equivalent.

the correct version of this faulty parallelism in the sentence is:

jefferson wrote the declaration of independence, and he was the nation's third president.

the problem with the first version is that the sentence:

"jefferson was both the writer of the declaration of independence"

presents jefferson as both a subject and an agent for the verb "write" because if he was "the writer" then the declaration of independence was written by him, besides that fact, the sentence presents a dependent clause.

while the second sentence:

he was the nation's third president.

presents a basic subject+verb+object structure

so, to give a proper balance to the structure, or better said, to give a parallel structure, we must write a basic s+v+o structure in both sentences:

jefferson wrote the declaration of independence, and he was the nation third president.

can you type the questions out? we cant really see anything